import org.omg.Messaging.SYNC_WITH_TRANSPORT;

import java.util.Scanner;

public class ZuoYeEr {
    public static void main(String[] args) {
        Scanner input=new Scanner(System.in);
        System.out.println("请输入英寸数");
        double a=input.nextDouble();
        double b=2.54*a;
        System.out.print(b);
        System.out.print("厘米");
    }
}
